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The pH of a 0.1 molar solution of the ac...

The `pH` of a `0.1` molar solution of the acid `HQ` is `3`. The value of the ionisation constant, `K_(a)` of the acid is

A

`3xx10^(-1)`

B

`1xx10^(-3)`

C

`1xx10^(-5)`

D

`1xx10^(-7)`

Text Solution

Verified by Experts

The correct Answer is:
C
`{:(HQ,,hArr,,H^(+),,+,,Q^(-)),(0.1,,,,0,,,,0),(0.1-x,,,,x,,,,x):}`
`pH=3`, `[H^(+)]=10^(-3)`, `x=10^(-3)`
`K_(a)=((x)xx(x))/((0.1-x))=((10^(-3))^(2))/(0.1-10^(-3))~~(10^(-6))/(0.1)=10^(-5)`.
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